Pilot gas bypass system for fuel-fired furnaces

Details Pilot gas bypass system for fuel-fired furnaces Pilot gas bypass system for fuel-fired furnaces

1989-09-28

1990-05-22

Dority, Carroll B.

Stoves and furnaces

Hot-air furnaces

Compressed air

126116R, F24H 300

Patent

active

049268406

ABSTRACT:
To inhibit internal heat exchanger corrosion, the products of combustion from a standing pilot flame in an induced draft, fuel-fired furnace are prevented from migrating through the heat exchanger during idle periods of the furnace by flowing the products of combustion upwardly through a small vent tube into the outlet section of the draft inducer fan, and then into an external exhaust stack, thereby bypassing the heat exchanger. During operation of the draft inducer fan a negative pressure is maintained within the vent tube, to prevent combustion gas outflow therethrough which might otherwise snuff out the pilot flame, by a venturi structure positioned within the draft inducer fan outlet section adjacent its juncture with the vent tube.

REFERENCES:
patent: 2499358 (1950-03-01), Cooper et al.
patent: 2521866 (1950-09-01), Ott
patent: 2769619 (1956-11-01), Juhasz
patent: 3194214 (1965-07-01), Frendberg
patent: 3667451 (1972-06-01), Boucher
patent: 4533315 (1985-08-01), Nelson
patent: 4576226 (1986-03-01), Lipets
patent: 4603681 (1986-08-01), Clawson
patent: 4807588 (1989-02-01), Beatley

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